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MUST KNOW FOR THE GMAT: The length of any side of a triangle must be larger than the positive difference of the other two sides, but smaller than the sum of the other two sides.

When we consider the two statements together we can see that the case of {16, 16, 32} is not possible since the sum of two sides (16 and 16) is not greater then the third side (32), so only the following case is possible: {16, 32, 32}, which gives the perimeter equal to 16+32+32=80.

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16 Jun 2012, 04:15

Higher then 550 for sure. I think 600.

Unless we know the property "The length of any side of a triangle must be larger than the positive difference of the other two sides, but smaller than the sum of the other two sides", we can not answer the question easily.

Stmt 1: We can know the second side but don't know the length of third side.Stmt 2: Same logic as given for stmt 1.

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23 Jul 2012, 06:47

What is the perimeter of isosceles triangle MNP?PERIMETER=MN+NP+MPNot given which sides are equal(1) MN = 16NP&MP unavailable so insufficient(2) NP = 20MN&MP unavailable so insufficientfrom (i)&(ii)Perimeter=MN+NP+MP=16+20+?, we don't know which two sides are equal;insufficient (E)
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12 Dec 2014, 01:34

Bunuel wrote:

What is the perimeter of isosceles triangle MNP?

(1) MN = 16(2) NP = 20

Diagnostic TestQuestion: 28Page: 25Difficulty: 550

Hi all,

when reading "What is the perimeter of Isosceles Triangle MNP", how can I be sure that "MNP" stands for the vertices (as it is the case here) and not for the sides?If M, N and P each were sides, the result to the question in my opinion would change to "C", as M*N and N*P would HAVE to account for 4*4 and 4*5 in this logic as we're dealing with an isosceles and the rule for the sum of two triangle sides doesn't allow any other solution.

How can I identify these variables to be representing vertices instead of sides?

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when reading "What is the perimeter of Isosceles Triangle MNP", how can I be sure that "MNP" stands for the vertices (as it is the case here) and not for the sides?If M, N and P each were sides, the result to the question in my opinion would change to "C", as M*N and N*P would HAVE to account for 4*4 and 4*5 in this logic as we're dealing with an isosceles and the rule for the sum of two triangle sides doesn't allow any other solution.

How can I identify these variables to be representing vertices instead of sides?

ThanksChristian

You are over-thinking this one. Capital letters refer to vertices.
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22 Dec 2014, 10:12

Bunuel wrote:

christian1904 wrote:

Bunuel wrote:

What is the perimeter of isosceles triangle MNP?

(1) MN = 16(2) NP = 20

Diagnostic TestQuestion: 28Page: 25Difficulty: 550

Hi all,

when reading "What is the perimeter of Isosceles Triangle MNP", how can I be sure that "MNP" stands for the vertices (as it is the case here) and not for the sides?If M, N and P each were sides, the result to the question in my opinion would change to "C", as M*N and N*P would HAVE to account for 4*4 and 4*5 in this logic as we're dealing with an isosceles and the rule for the sum of two triangle sides doesn't allow any other solution.

How can I identify these variables to be representing vertices instead of sides?

ThanksChristian

You are over-thinking this one. Capital letters refer to vertices.

Would the angle rules of isosceles triangles not apply here? Since we know sides of 16, 20 - would the remaining side not have to be 16 in order to maintain 1:1:\sqrt{2} ???